Automatic fire-alarm system.



F. GOTTSCHALK.

AUTOMATIC FIRE ALARM SYSTEM.

M @M/ l APPLICATION FILED FEB. 13. 1914.

Patented May 18, 1915.

'mmzzx tion of the ordinary telephone instrument TED s'ra ATENT onruc FELIX GOTTSCHALK, OF STIRLING, NEIV J ERSEY.

hn'romn'rlc FIREAL'ARM SYSTEM.

Application filed February 13,

and its associated line 'and central oflice equipment for the transmissionofianj alarm signal automatically, by the mechanical operation of the usual telephone receiver-hook mechanism by a thermostatic device.-

A further iobjectis the elimination of any electrical connections, or theattachment of any circuit operating devices to the telephone line, the sending of the fire all being accomplished entirely by the mechanical actuation of the telephone receiver-hook.

Another object is to produce a mechanical attachment, easily installed on any telephone instrument, for the purpose, specified.

There are other objects as hereinafter set forth. y In the accompanying drawings, Figure 1 is a diagram illustrating the principle ofmy invention, and Fig. 2, a modification of Fig. 1.

Like figures of reference denote the same parts Wherever they are shown.

1 denotes the framework of a telephone instrument. For the sake of illustration a desk telephone is shown.

2 designates the usual receiver hook.

3 and s indicate suitable clamping devices, between which is the fusible member 5, adapted to melt at an abnormal temperaturesay 150 degrees Fahrenheit.

Connected to clamp l is the support 6, on which is placed a suitable weight for instance the telephone receiver 7.

In operation, the telephone instrument being connected to a central oilice equipped with the usual common battery apparatus whereby a signal is displayed upon the removal of the receiver from the hook at the telephone, upon an abnormal rise in temperature, member 5 melts, thereby releasing weight 7 and allowing hoolrswitchkfi to op: crate its contacts in the usual manner there by signaling the central office. As a system of this character would be used principally Specification of Letters Patent.

normal heat.

I Patented May 18, 1914. Serial No. 818,503.

at night, the exchange attendant wouldimieis.

mediately know, that, a signal, displayed during this period, without any response from thetelephone, would mean a fire-signal. Fig. 2 is a modification of Fig; 1, 'and shows an arrangement whereby the useof a weight is dispensed-,fwith, the membert. be-

ing connected to-a suitable lug 8 formed on the si ea fnieersin 1.

oligiitilizing the standard telephone instruinent and its associated line and central office apparatus, without complicating. the

same by the addition of electrically operated devices for sending in the alarm, and that my device-is purely mechanical, and does not affect the regular operation in any manner.

I claini 1. In an alarm system of the character described, in combination, a receiver book, a weight, and meansfor attaching said weight to said hook comprising a member adapted to release said weight in the presence of ab- 2. In an alarm system of the character described, a telephone having a gravity switch hook, a telephone receiver, means for holdin}; said receiver clamped to said hook, said means comprising a member adapted to re} lieve said switch hook of the weight of said receiver in the presence of abnormal heat.

It, willffllie seen that my invention consists",

of the telephone 3. In an alarm system of the character described, in combination with a telephone instrument having a gravity hook switch, of a telephone receiver and means for supporting said receiver, said means being connected to said hook switch by a member adapted to melt in the presence of abnormal heat.

4. In an alarm system of the character described, a telephone receiver, a support therefor, a fusible linkremovably connected to said support and means for removably connecting said fusible link to the switch hook of said telephone instrument, substantially as described;

5. In an alarm system of the character described, a telephone having a switch hook, means for clamping the switch hook to the telephone, said means including a member adapted to release said hook in the presence of abnormal heat. a y

In an axle rm system of the character at scribed, a telephone having switching mechanism and means for holding said mechanism in its normal restra ned position, said i, means comnrising a member adapted to reheld in its normal position, substantially 1s lease said mechanism in the presence of abdescribed. I 10 normal heat. In testimony whereof I hereunto afiix my 7. In an alarm system of the character designature in the presence of two witnesses. 5 scribed, a telephone instrument having a FELIX GOTTSCHALK;

switch hook and means comprising a mem- (Witnesses: ber adapted to melt in the presence of'ab- 1' "JULIAN G. BENNETT,

normal heat, whereby said switch hook is CHAS. LUBRECHT. 

